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https://issues.apache.org/jira/browse/HIVE-7464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14116096#comment-14116096
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Laljo John Pullokkaran commented on HIVE-7464:
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Fixed by HIVE-7814
> CBO:Add rule for Join Simplification
> ------------------------------------
>
> Key: HIVE-7464
> URL: https://issues.apache.org/jira/browse/HIVE-7464
> Project: Hive
> Issue Type: Sub-task
> Reporter: Laljo John Pullokkaran
> Assignee: Laljo John Pullokkaran
>
> Fil (R1.x=r2.x) <- Cross Join can be translated to
> Inner Join.
> Similarly Filter followed by Outer joins can be used to translate outer joins
> to inner joins.
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